p#back-to-top {
	position: fixed;
	bottom: 0px;
	right: 0px;
}

p#back-to-top a {
	text-align: center;
	text-decoration: none;
	color: #d1d1d1;
	display: block;
	width: 40px;
	/*使用CSS3中的transition属性给跳转链接中的文字添加渐变效果*/
	-moz-transition: color 1s;
	-webkit-transition: color 1s;
	-o-transition: color 1s;
}

p#back-to-top a:hover {
	color: #979797;
}

p#back-to-top a span {
	background: #d1d1d1 url(../img/back-top.png) no-repeat center center;
	border-radius: 6px;
	display: block;
	height: 40px;
	width: 40px;
	margin-bottom: 5px;
	/*使用CSS3中的transition属性给<span>标签背景颜色添加渐变效果*/
	-moz-transition: background 1s;
	-webkit-transition: background 1s;
	-o-transition: background 1s;
}

#back-to-top a:hover span {
	background: #979797 url(../img/back-top.png) no-repeat center center;
}